Getting together in Soho: nice to get wasted (8)
I believe the answer is:
cohesion
'getting together' is the definition.
(cohesion means cohering or coming together)
'soho nice to get wasted' is the wordplay.
'to get wasted' indicates an anagram.
'soho'+'nice'='sohonice'
'sohonice' with letters rearranged gives 'COHESION'.
'in' is the link.
(Other definitions for cohesion that I've seen before include "Action of forming a united whole" , "Tendency to unite" , "Sticking together" , "Tendency to stick together" , "unity" .)